I am trying to determine the direction and distance I need to move for alignment. I measured the bell bore with dial indicator starting at 0 at the top. Ended up with .024 at 9 o'clock, .026 at 8 o'clock, .014 at 6 oclock, .004 at 3 o'clock and .002 at 2 o'clock position. So taking the total of .028 I figured that I could use the .014 adjustable dowels.

At which position should the eliptical portion of the dowel be?

Does using an abitrary zeroing of the indicator at the starting point cause an error for that location?
SS

I am trying to determine the direction and distance I need to move for alignment. I measured the bell bore with dial indicator starting at 0 at the top. Ended up with .024 at 9 o'clock, .026 at 8 o'clock, .014 at 6 oclock, .004 at 3 o'clock and .002 at 2 o'clock position. So taking the total of .028 I figured that I could use the .014 adjustable dowels.

At which position should the eliptical portion of the dowel be?

Does using an abitrary zeroing of the indicator at the starting point cause an error for that location?
SS

Don't know what you're shooting for for tolerance, but it appears that you should direct the dowels toward the 8 & 9 o'clock position. There is a great article (with pics) in the tran forum for installing a TKO tran, where you have to do this.

If my runout is .026 at 8 and .024 at 9 oclock wouldn't I direct the dowels in the opposite direction between 2 and 3 clock? for the total of .028/2=.014

I am looking to a least meet the minimum tolerance of .005.

The other question is: if I am moving the BH in a certain direction a distance of .014 and starting at an arbitrary point with the reading of zero at 12 oclock then I should read between .012 and .010 at 9, 6, 3 oclock positions and that would indicate center.

Correct?

Hopefully someone can follow my logic!

SS

"center" doesn't matter, only relative needle movement.
When I did mine, I "zeroed" the needle at a 1/2" reading, and kept track of neg and positive numbers.

Assuming your needle is moving "in" (positive direction) you need to move toward the bigger numbers.

I started with an arbitrary number away from zero because I didn’t want to deal with negative numbers.

http://geocities.com/sdampier@sbcglobal.net/Team_Camaro/Bellhousing-022.jpg

Take a look at the bellhousing on the left. Notice the 9’s directly opposed each other? If the bellhousing is moved .003” in the direction of the arrow all of the numbers would equal 9 and the bellhousing would be in perfect alignment.

It’s the same for the bellhousing on the right. The 8’s are directly opposed to each other. Move the bellhousing .004 in the direction of the arrow and all of the numbers would equal 8.

In terms of movement, what you said steve is what I was trying to get across. However, my numbers were negative on the majority of the sweep in the counter clockwise direction until I reached 3 oclock which was a positive .004. I will have to double check them. But between what you and Jim have said I think I have it straight.
Now I understand DBX!

Thanks a lot for the help! SS